Main Microphone - LG P705 Service Manual

4.19.4 Main Microphone

MIC Signal: MIC800 -> FB800, FB802(TP2) -> C211(TP3) MIC_1P of MSM7227A-1-AA
MIC Bias: MSM7227A-1-AA MIC_BIAS -> MIC800
Make some sound or voice to MIC
Some sound signal appears at
Some sound signal appears at
Change the U200(MSM7227A-1-AA) or
LGE Internal Use Only
START
Make a call
C202, C201, C200(TP1) is
about 1.8bV?
Yes
FB800, FB802(TP2)?
No
C210, C211(TP3)?
No
Change the Main PCB.
No
Change the U200(MSM7227A-1-AA) or
change the Main PCB.
Yes
Change the MIC
Yes
Re-contact or test the new lower
FPCB.(If It's OK, Change the FPCB)
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4. TROUBLE SHOOTING
Only for training and service purposes